Do you need to know, when is the best time to go to Finland? Then you should take a look here, what weather you can expect there during the year.
The climate of Finland is cold temperate, in some areas it is subarctic. Winter is the longest season in Finland, summer as long as winter only on the south coast. You can expect snow in winter, quite cool summers and cold winters. But the weather is relatively mild, thanks to the Baltic Sea and more than 60,000 lakes.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Archipelago Sea, Bengtskär, Brändö, Central Finland, Central Ostrobothnia, Eckerö, Enontekiö, Espoo, Finland Proper, Finnish Lakeland, Finnish Lapland, Forssa, Hailuoto, Hamina, Hammaslahti, Hanko, Heinola, Heinävesi, Helsinki, Hetta, Hyrynsalmi, Hyvinkää, Hämeenlinna, Ii, Iisalmi, Ikaalinen, Imatra, Inari, Ingå, Isojoki, Ivalo, Jakobstad, Jalasjärvi, Joensuu, Jokioinen, Joutseno, Jyväskylä, Järvenpää, Kaarina, Kainuu and Eastern Oulu region, Kajaani, Kalajoki, Kangasala, Karesuvanto, Karigasniemi, Karijoki, Kauhava, Kemi, Kemijärvi, Kerava, Kerimäki, Kilpisjärvi, Kimitoön, Kirkkonummi, Kittilä, Kokkola, Kolari, Koli National Park, Kontiolahti, Korpo, Kotka, Kouvola, Kristinestad, Kuhmo, Kuopio, Kuortane, Kurjenrahka National Park, Kuusamo, Kvarken Archipelago, Kymenlaakso, Käsivarsi Wilderness Area, Kökar, Lahti, Laihia, Lappajärvi, Lappeenranta, Lapua, Leivonmäki National Park, Lemmenjoki National Park, Lempäälä, Levi, Lieksa, Lohja, Loimaa, Loviisa, Luosto, Mariehamn, Mikkeli, Muotkatunturit Wilderness Area, Muurame, Naantali, Nagu, Nivala, Nokia, North Karelia, North Savonia, Northern Finland, Nuorgam, Nurmes, Nuuksio National Park, Närpes, Ostrobothnia, Oulu, Padasjoki, Pallas Yllästunturi National Park, Pargas, Petäjävesi, Pieksämäki, Pirkanmaa, Pori, Porvoo, Posio, Punkaharju, Pyhäjärvi, Päijänne Tavastia, Pöyrisjärvi Wilderness Area, Raahe, Ranua, Raseborg, Rauma, Rautalampi, Riisitunturi National Park, Rovaniemi, Ruka, Saariselkä, Saimaa, Salamajärvi National Park, Salo, Satakunta, Savonlinna, Seinäjoki, Sipoo, Siuntio, Sodankylä, Sonkajärvi, South Karelia, South Savonia, Southern Finland, Southern Ostrobothnia, Southern Oulu region, Sulkava, Suomenniemi, Suomu, Tampere, Tankavaara, Tavastia Proper, Tornio, Turku, Urho Kekkonen National Park, Utsjoki, Uusikaupunki, Uusimaa, Vaasa, Valtimo, Vantaa and Northern Helsinki, Varkaus, Vesanto, West Coast, Western Oulu region, Ylivieska, Ylläs, Äkäslompolo, Äänekoski, Åland, Örö.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is July, the average maximum temperature is 21.5 ℃ (70.7 ℉). The average minimum temperature in this month is 11.8 ℃ (53.24 ℉). The coldest month here is February, the average maximum temperature is -2.7 ℃ (27.14 ℉). The average minimum temperature in this month is -9.1 ℃ (15.62 ℉). The most rainy month here is December, the average number of rainy days is 12. The least rainy month here is May, the average number of rainy days is 6.1. 
When travelling to some places in Finland, always consider the altitude of the the place as well. The highest point here is Halti (alternatively Haltia Haltitunturi Haltiatunturi) (1328 m) and the lowest point is Baltic Sea (0 m). So the differences in altitudes in this country are not negligible and you should expect the weather to be different in places in different altitudes. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Finland in January is this: The average highest temperature in Finland in January is -2.4 ℃ (27.68 ℉). The average lowest temperature is -8.2 ℃ (17.24 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around -1.5 ℃ (29.3 ℉). At the end of January you can expect lower temperatures, the average highest temperature is around -2.55 ℃ (27.41 ℉). The average number of rainy days in January is 9.9. The average rainfall is 43.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 5:56 (hours and minutes), in the middle of the month 6:40 and at the end of the month 7:47.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in February is this: The average highest temperature in Finland in February is -2.7 ℃ (27.14 ℉). The average lowest temperature is -9.1 ℃ (15.62 ℉). At the beginning of February you can expect higher temperatures, the average highest temperature is around -2.55 ℃ (27.41 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around -0.7 ℃ (30.74 ℉). The average number of rainy days in February is 7.9. The average rainfall is 33.6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 7:47 (hours and minutes), in the middle of the month 9:05 and at the end of the month 10:27.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in March is this: The average highest temperature in Finland in March is 1.3 ℃ (34.34 ℉). The average lowest temperature is -5.5 ℃ (22.1 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around -0.7 ℃ (30.74 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 4.55 ℃ (40.19 ℉). The average number of rainy days in March is 7.9. The average rainfall is 35.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:27 (hours and minutes), in the middle of the month 11:50 and at the end of the month 13:12.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Finland in April is this: The average highest temperature in Finland in April is 7.8 ℃ (46.04 ℉). The average lowest temperature is -0.5 ℃ (31.1 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 4.55 ℃ (40.19 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 11.65 ℃ (52.97 ℉). The average number of rainy days in April is 6.9. The average rainfall is 36.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:12 (hours and minutes), in the middle of the month 14:35 and at the end of the month 15:56.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Finland in May is this: The average highest temperature in Finland in May is 15.5 ℃ (59.9 ℉). The average lowest temperature is 4.6 ℃ (40.28 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 11.65 ℃ (52.97 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 17.55 ℃ (63.59 ℉). The average number of rainy days in May is 6.1. The average rainfall is 35.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:56 (hours and minutes), in the middle of the month 17:12 and at the end of the month 18:15.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in June is this: The average highest temperature in Finland in June is 19.6 ℃ (67.28 ℉). The average lowest temperature is 9.7 ℃ (49.46 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 17.55 ℃ (63.59 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 20.55 ℃ (68.99 ℉). The average number of rainy days in June is 7.9. The average rainfall is 48.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 18:15 (hours and minutes), in the middle of the month 18:52 and at the end of the month 18:51.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in July is this: The average highest temperature in Finland in July is 21.5 ℃ (70.7 ℉). The average lowest temperature is 11.8 ℃ (53.24 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 20.55 ℃ (68.99 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 20.55 ℃ (68.99 ℉). The average number of rainy days in July is 9. The average rainfall is 70.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 18:51 (hours and minutes), in the middle of the month 18:11 and at the end of the month 17:08.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in August is this: The average highest temperature in Finland in August is 19.6 ℃ (67.28 ℉). The average lowest temperature is 10.8 ℃ (51.44 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 20.55 ℃ (68.99 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 16.75 ℃ (62.15 ℉). The average number of rainy days in August is 10.8. The average rainfall is 77.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 17:08 (hours and minutes), in the middle of the month 15:52 and at the end of the month 14:32.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in September is this: The average highest temperature in Finland in September is 13.9 ℃ (57.02 ℉). The average lowest temperature is 6.4 ℃ (43.52 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 16.75 ℃ (62.15 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 11.2 ℃ (52.16 ℉). The average number of rainy days in September is 11. The average rainfall is 68.9 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:32 (hours and minutes), in the middle of the month 13:11 and at the end of the month 11:49.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in October is this: The average highest temperature in Finland in October is 8.5 ℃ (47.3 ℉). The average lowest temperature is 2.5 ℃ (36.5 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 11.2 ℃ (52.16 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 5.6 ℃ (42.08 ℉). The average number of rainy days in October is 11.1. The average rainfall is 74.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:49 (hours and minutes), in the middle of the month 10:28 and at the end of the month 9:07.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in November is this: The average highest temperature in Finland in November is 2.7 ℃ (36.86 ℉). The average lowest temperature is -2.2 ℃ (28.04 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 5.6 ℃ (42.08 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 1.05 ℃ (33.89 ℉). The average number of rainy days in November is 11.8. The average rainfall is 68.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:07 (hours and minutes), in the middle of the month 7:49 and at the end of the month 6:42.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Finland in December is this: The average highest temperature in Finland in December is -0.6 ℃ (30.92 ℉). The average lowest temperature is -6.5 ℃ (20.3 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 1.05 ℃ (33.89 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around -1.5 ℃ (29.3 ℉). The average number of rainy days in December is 12. The average rainfall is 58.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 6:42 (hours and minutes), in the middle of the month 5:57 and at the end of the month 5:49.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.| Helsinki Vantaa | temperature: - | highest temperature: -0.6 ℃ (30.92 ℉) | lowest temperature: -6.5 ℃ (20.3 ℉) | rainfall: 58.2mm | rainy days: 12 |
| Turku | temperature: - | highest temperature: -0.1 ℃ (31.82 ℉) | lowest temperature: -5.6 ℃ (21.92 ℉) | rainfall: 65.3mm | rainy days: 12.2 |
| Tampere | temperature: - | highest temperature: -1.7 ℃ (28.94 ℉) | lowest temperature: -7.7 ℃ (18.14 ℉) | rainfall: 38.9mm | rainy days: 11 |
| Kuopio | temperature: - | highest temperature: -3.8 ℃ (25.16 ℉) | lowest temperature: -9.9 ℃ (14.18 ℉) | rainfall: 45.5mm | rainy days: 11.2 |
| Rovaniemi | temperature: - | highest temperature: -6.9 ℃ (19.58 ℉) | lowest temperature: -13 ℃ (8.6 ℉) | rainfall: 42.2mm | rainy days: 10.2 |